#ifndef _STRING_H_
#define _STRING_H_

#ifndef NULL
#define NULL ((void *) 0)
#endif

#ifndef _SIZE_T
#define _SIZE_T
typedef unsigned int size_t;
#endif
extern char *___strtok;
extern char *strerror(int errno);

/*
 * This string-include defines all string functions as inline
 * functions. Use gcc. It also assumes ds=es=data space, this should be
 * normal. Most of the string-functions are rather heavily hand-optimized,
 * see especially strtok,strstr,str[c]spn. They should work, but are not
 * very easy to understand. Everything is done entirely within the register
 * set, making the functions fast and clean. String instructions have been
 * used through-out, making for "slightly" unclear code :-)
 *
 *		(C) 1991 Linus Torvalds
 */

//inline char *strcpy(char *dest, const char *src);
//
//inline char *strcat(char *dest, const char *src);
//
//inline int strcmp(const char *cs, const char *ct);
//
//inline int strspn(const char *cs, const char *ct);
//
//inline int strcspn(const char *cs, const char *ct);
//
//inline char *strpbrk(const char *cs, const char *ct);
//
//inline char *strstr(const char *cs, const char *ct);
//
//inline int strlen(const char *s);
//
//
//
//inline char *strtok(char *s, const char *ct);

/*
 * Changes by falcon<zhangjinw@gmail.com>, the original return value is static
 * inline ... it can not be called by other functions in another files.
 */

//inline void *memcpy(void *dest, const void *src, int n);
//
//inline void *memmove(void *dest, const void *src, int n);
//
//inline void *memchr(const void *cs, char c, int count);
//
//inline void *memset(void *s, char c, int count);
//
//inline char *strncpy(char *dest, const char *src, int count);
//
//inline char *strchr(const char *s, char c);
//
//inline int strncmp(const char * cs,const char * ct,int count);




inline char * strcpy(char * dest,const char *src)
{
    __asm__("cld\n"
            "1:\tlodsb\n\t"
            "stosb\n\t"
            "testb %%al,%%al\n\t"
            "jne 1b"
    ::"S" (src),"D" (dest));
    return dest;
}

inline char * strncpy(char * dest,const char *src,int count)
{
    __asm__("cld\n"
            "1:\tdecl %2\n\t"
            "js 2f\n\t"
            "lodsb\n\t"
            "stosb\n\t"
            "testb %%al,%%al\n\t"
            "jne 1b\n\t"
            "rep\n\t"
            "stosb\n"
            "2:"
    ::"S" (src),"D" (dest),"c" (count));
    return dest;
}

inline char * strcat(char * dest,const char * src)
{
    __asm__("cld\n\t"
            "repne\n\t"
            "scasb\n\t"
            "decl %1\n"
            "1:\tlodsb\n\t"
            "stosb\n\t"
            "testb %%al,%%al\n\t"
            "jne 1b"
    ::"S" (src),"D" (dest),"a" (0),"c" (0xffffffff));
    return dest;
}

inline char * strncat(char * dest,const char * src,int count)
{
    __asm__("cld\n\t"
            "repne\n\t"
            "scasb\n\t"
            "decl %1\n\t"
            "movl %4,%3\n"
            "1:\tdecl %3\n\t"
            "js 2f\n\t"
            "lodsb\n\t"
            "stosb\n\t"
            "testb %%al,%%al\n\t"
            "jne 1b\n"
            "2:\txorl %2,%2\n\t"
            "stosb"
    ::"S" (src),"D" (dest),"a" (0),"c" (0xffffffff),"g" (count)
    );
    return dest;
}

inline int strcmp(const char * cs,const char * ct)
{
    register int __res ;
    __asm__("cld\n"
            "1:\tlodsb\n\t"
            "scasb\n\t"
            "jne 2f\n\t"
            "testb %%al,%%al\n\t"
            "jne 1b\n\t"
            "xorl %%eax,%%eax\n\t"
            "jmp 3f\n"
            "2:\tmovl $1,%%eax\n\t"
            "jl 3f\n\t"
            "negl %%eax\n"
            "3:"
    :"=a" (__res):"D" (cs),"S" (ct));
    return __res;
}


inline int strncmp(const char * cs,const char * ct,int count)
{
    register int __res ;
    __asm__("cld\n"
            "1:\tdecl %3\n\t"
            "js 2f\n\t"
            "lodsb\n\t"
            "scasb\n\t"
            "jne 3f\n\t"
            "testb %%al,%%al\n\t"
            "jne 1b\n"
            "2:\txorl %%eax,%%eax\n\t"
            "jmp 4f\n"
            "3:\tmovl $1,%%eax\n\t"
            "jl 4f\n\t"
            "negl %%eax\n"
            "4:"
    :"=a" (__res):"D" (cs),"S" (ct),"c" (count));
    return __res;
}

inline char * strchr(const char * s,char c)
{
    register char * __res ;
    __asm__("cld\n\t"
            "movb %%al,%%ah\n"
            "1:\tlodsb\n\t"
            "cmpb %%ah,%%al\n\t"
            "je 2f\n\t"
            "testb %%al,%%al\n\t"
            "jne 1b\n\t"
            "movl $1,%1\n"
            "2:\tmovl %1,%0\n\t"
            "decl %0"
    :"=a" (__res):"S" (s),"0" (c));
    return __res;
}

inline char * strrchr(const char * s,char c)
{
    register char * __res;
    __asm__("cld\n\t"
            "movb %%al,%%ah\n"
            "1:\tlodsb\n\t"
            "cmpb %%ah,%%al\n\t"
            "jne 2f\n\t"
            "movl %%esi,%0\n\t"
            "decl %0\n"
            "2:\ttestb %%al,%%al\n\t"
            "jne 1b"
    :"=d" (__res):"0" (0),"S" (s),"a" (c));
    return __res;
}

inline int strspn(const char * cs, const char * ct)
{
    register char * __res;
    __asm__("cld\n\t"
            "movl %4,%%edi\n\t"
            "repne\n\t"
            "scasb\n\t"
            "notl %%ecx\n\t"
            "decl %%ecx\n\t"
            "movl %%ecx,%%edx\n"
            "1:\tlodsb\n\t"
            "testb %%al,%%al\n\t"
            "je 2f\n\t"
            "movl %4,%%edi\n\t"
            "movl %%edx,%%ecx\n\t"
            "repne\n\t"
            "scasb\n\t"
            "je 1b\n"
            "2:\tdecl %0"
    :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
    );
    return __res-cs;
}

inline int strcspn(const char * cs, const char * ct)
{
    register char * __res;
    __asm__("cld\n\t"
            "movl %4,%%edi\n\t"
            "repne\n\t"
            "scasb\n\t"
            "notl %%ecx\n\t"
            "decl %%ecx\n\t"
            "movl %%ecx,%%edx\n"
            "1:\tlodsb\n\t"
            "testb %%al,%%al\n\t"
            "je 2f\n\t"
            "movl %4,%%edi\n\t"
            "movl %%edx,%%ecx\n\t"
            "repne\n\t"
            "scasb\n\t"
            "jne 1b\n"
            "2:\tdecl %0"
    :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
    );
    return __res-cs;
}

inline char * strpbrk(const char * cs,const char * ct)
{
    register char * __res ;
    __asm__("cld\n\t"
            "movl %4,%%edi\n\t"
            "repne\n\t"
            "scasb\n\t"
            "notl %%ecx\n\t"
            "decl %%ecx\n\t"
            "movl %%ecx,%%edx\n"
            "1:\tlodsb\n\t"
            "testb %%al,%%al\n\t"
            "je 2f\n\t"
            "movl %4,%%edi\n\t"
            "movl %%edx,%%ecx\n\t"
            "repne\n\t"
            "scasb\n\t"
            "jne 1b\n\t"
            "decl %0\n\t"
            "jmp 3f\n"
            "2:\txorl %0,%0\n"
            "3:"
    :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
    );
    return __res;
}

inline char * strstr(const char * cs,const char * ct)
{
    register char * __res ;
    __asm__("cld\n\t" \
                "movl %4,%%edi\n\t"
            "repne\n\t"
            "scasb\n\t"
            "notl %%ecx\n\t"
            "decl %%ecx\n\t"	/* NOTE! This also sets Z if searchstring='' */
            "movl %%ecx,%%edx\n"
            "1:\tmovl %4,%%edi\n\t"
            "movl %%esi,%%eax\n\t"
            "movl %%edx,%%ecx\n\t"
            "repe\n\t"
            "cmpsb\n\t"
            "je 2f\n\t"		/* also works for empty string, see above */
            "xchgl %%eax,%%esi\n\t"
            "incl %%esi\n\t"
            "cmpb $0,-1(%%eax)\n\t"
            "jne 1b\n\t"
            "xorl %%eax,%%eax\n\t"
            "2:"
    :"=a" (__res):"0" (0),"c" (0xffffffff),"S" (cs),"g" (ct)
    );
    return __res;
}

inline int strlen(const char * s)
{
    register int __res ;
    __asm__("cld\n\t"
            "repne\n\t"
            "scasb\n\t"
            "notl %0\n\t"
            "decl %0"
    :"=c" (__res):"D" (s),"a" (0),"0" (0xffffffff));
    return __res;
}

inline char * strtok(char * s,const char * ct)
{
    register char * __res ;
    __asm__("testl %1,%1\n\t"
            "jne 1f\n\t"
            "testl %0,%0\n\t"
            "je 8f\n\t"
            "movl %0,%1\n"
            "1:\txorl %0,%0\n\t"
            "movl $-1,%%ecx\n\t"
            "xorl %%eax,%%eax\n\t"
            "cld\n\t"
            "movl %4,%%edi\n\t"
            "repne\n\t"
            "scasb\n\t"
            "notl %%ecx\n\t"
            "decl %%ecx\n\t"
            "je 7f\n\t"			/* empty delimeter-string */
            "movl %%ecx,%%edx\n"
            "2:\tlodsb\n\t"
            "testb %%al,%%al\n\t"
            "je 7f\n\t"
            "movl %4,%%edi\n\t"
            "movl %%edx,%%ecx\n\t"
            "repne\n\t"
            "scasb\n\t"
            "je 2b\n\t"
            "decl %1\n\t"
            "cmpb $0,(%1)\n\t"
            "je 7f\n\t"
            "movl %1,%0\n"
            "3:\tlodsb\n\t"
            "testb %%al,%%al\n\t"
            "je 5f\n\t"
            "movl %4,%%edi\n\t"
            "movl %%edx,%%ecx\n\t"
            "repne\n\t"
            "scasb\n\t"
            "jne 3b\n\t"
            "decl %1\n\t"
            "cmpb $0,(%1)\n\t"
            "je 5f\n\t"
            "movb $0,(%1)\n\t"
            "incl %1\n\t"
            "jmp 6f\n"
            "5:\txorl %1,%1\n"
            "6:\tcmpb $0,(%0)\n\t"
            "jne 7f\n\t"
            "xorl %0,%0\n"
            "7:\ttestl %0,%0\n\t"
            "jne 8f\n\t"
            "movl %0,%1\n"
            "8:"
    :"=b" (__res),"=S" (___strtok)
    :"0" (___strtok),"1" (s),"g" (ct)
    );
    return __res;
}

inline void * memcpy(void * dest,const void * src, int n)
{
    __asm__ ("cld\n\t"
             "rep\n\t"
             "movsb"
    ::"c" (n),"S" (src),"D" (dest)
    );
    return dest;
}

inline void * memmove(void * dest,const void * src, int n)
{
    if (dest<src)
            __asm__("cld\n\t"
                    "rep\n\t"
                    "movsb"
            ::"c" (n),"S" (src),"D" (dest)
            );
    else
            __asm__("std\n\t"
                    "rep\n\t"
                    "movsb"
            ::"c" (n),"S" (src+n-1),"D" (dest+n-1)
            );
    return dest;
}

inline int memcmp(const void * cs,const void * ct,int count)
{
    register int __res ;
    __asm__("cld\n\t"
            "repe\n\t"
            "cmpsb\n\t"
            "je 1f\n\t"
            "movl $1,%%eax\n\t"
            "jl 1f\n\t"
            "negl %%eax\n"
            "1:"
    :"=a" (__res):"0" (0),"D" (cs),"S" (ct),"c" (count)
    );
    return __res;
}

inline void * memchr(const void * cs,char c,int count)
{
    register void * __res ;
    if (!count)
        return NULL;
    __asm__("cld\n\t"
            "repne\n\t"
            "scasb\n\t"
            "je 1f\n\t"
            "movl $1,%0\n"
            "1:\tdecl %0"
    :"=D" (__res):"a" (c),"D" (cs),"c" (count)
    );
    return __res;
}

inline void * memset(void * s,char c,int count)
{
    __asm__("cld\n\t"
            "rep\n\t"
            "stosb"
    ::"a" (c),"D" (s),"c" (count)
    );
    return s;
}







#endif